Browsing by Author "Bethwaite, C. F."

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    The instrumentation of an aircraft (De Havilland "dove") for flight-test instruction
    (College of Aeronautics, Cranfield, 1953-03) Bethwaite, C. F.; Newell, A. F.
    The teaching of flight-test methods and techniques plays an important part in the syllabus of the College of Aeronautics, and it has presented several problems, amongst them the provision of a “flying classroom” in which students can undertake flight –test investigations. Continues …
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    Note on the development of a trailing-edge flap as a stall-detector
    (College of Aeronautics, Cranfield, 1953-09) Bethwaite, C. F.
    A trailing-edge flap protruding slightly outside the wing profile has been developed as a stall detector and flight trials on “Anson” and “Provost” aircraft have proved successful. The device gave an adequate stall warning for all conditions of power and landing flaps and operated satisfactorily prior to stalls from steep turns. It was easily adjusted to give any desired warning speed to an accuracy of 1 m.p.h. and gave a two-stage warning, a preliminary warning preceding the final warning by about 3 m.p.h. Continues …
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    Notes on research into some aspects of stall-warning devices
    (College of Aeronautics, Cranfield, 1953-04) Bethwaite, C. F.; Langley, R. A.
    The problems of detecting and indicating an approaching stall have been investigated in flight on an “Anson” aircraft. A lower-surface flap near the leading-edge of the wing detects the approaching stall at a speed which depends critically on the length of the flap and on its location, but the margin of warning speed over stalling-speed is reasonably independent of landing-flap position and throttle setting. Continues …